private IotHubServiceClient(IotHubSasCredential credential, IotHubServiceClientOptions options)
        {
            options ??= new IotHubServiceClientOptions();
            _clientDiagnostics = new ClientDiagnostics(options);

            options.AddPolicy(new SasTokenAuthenticationPolicy(credential), HttpPipelinePosition.PerCall);
            _httpPipeline = HttpPipelineBuilder.Build(options);

            _devicesRestClient       = new DevicesRestClient(_clientDiagnostics, _httpPipeline, credential.Endpoint, options.GetVersionString());
            _modulesRestClient       = new ModulesRestClient(_clientDiagnostics, _httpPipeline, credential.Endpoint, options.GetVersionString());
            _queryRestClient         = new QueryRestClient(_clientDiagnostics, _httpPipeline, credential.Endpoint, options.GetVersionString());
            _statisticsRestClient    = new StatisticsRestClient(_clientDiagnostics, _httpPipeline, credential.Endpoint, options.GetVersionString());
            _configurationRestClient = new ConfigurationRestClient(_clientDiagnostics, _httpPipeline, credential.Endpoint, options.GetVersionString());
            _jobsRestClient          = new JobsRestClient(_clientDiagnostics, _httpPipeline, credential.Endpoint, options.GetVersionString());
            _bulkRegistryRestClient  = new BulkRegistryRestClient(_clientDiagnostics, _httpPipeline, credential.Endpoint, options.GetVersionString());

            // Note that the devices and modules subclient take a reference to the Query convenience layer client. This
            // is because they each expose a helper function that uses the query client for listing twins. By passing in
            // the convenience layer query client rather than the protocol layer query client, we minimize rewriting the
            // same pagination logic that now exists only in the query convenience layer client.
            Query          = new QueryClient(_queryRestClient);
            Devices        = new DevicesClient(_devicesRestClient, Query, _bulkRegistryRestClient);
            Modules        = new ModulesClient(_devicesRestClient, _modulesRestClient, Query, _bulkRegistryRestClient);
            Statistics     = new StatisticsClient(_statisticsRestClient);
            Configurations = new ConfigurationsClient(_configurationRestClient);

            Messages = new CloudToDeviceMessagesClient();
            Files    = new FilesClient();
            Jobs     = new JobsClient(_jobsRestClient);
        }
        /// <summary>
        /// Initializes a new instance of ConfigurationsClient.
        /// <param name="configurationRestClient"> The REST client to perform configurations operations. </param>
        /// </summary>
        internal ConfigurationsClient(ConfigurationRestClient configurationRestClient)
        {
            Argument.AssertNotNull(configurationRestClient, nameof(configurationRestClient));

            _configurationRestClient = configurationRestClient;
        }